This book will be helpful to post-graduate and research scholar at the beginning of their research carriers, and aims to provide general information, method of synthesis, reaction and biological activities of pyrazole. A large part of this book is concerned with review on biological activities of pyrazole derivatives. Some of the biological activities discussed, such as the antimicrobial, anticancer, anti-inflammatory and analgesic, anticonvulsant etc. The brief literature of biological activities helpful to the research scholars for the selection of their projects along with biological activities.